[1] Wu Liwei, Zheng Yingping, Wang Shaorong, Wang Zhenrong, et al. Oxygen ionic conductivity of a composite electrolyte SDC-LSGMprepared via glycine-nitrate process [J]. Journal of Southeast University (English Edition), 2010, 26 (1): 87-90. [doi:10.3969/j.issn.1003-7985.2010.01018]

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Oxygen ionic conductivity of a composite electrolyte SDC-LSGMprepared via glycine-nitrate process()

SDC-LSGM复合电解质的GNP法合成与氧离子电导性能

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Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

Volumn:

26

Issue:

2010 1

Page:

87-90

Research Field:

Electrical Engineering

Publishing date:

2010-03-30

Info

Title:

Oxygen ionic conductivity of a composite electrolyte SDC-LSGMprepared via glycine-nitrate process

SDC-LSGM复合电解质的GNP法合成与氧离子电导性能

Author(s):

Wu Liwei¹;  Zheng Yingping¹;  Wang Shaorong²;  Wang Zhenrong²;  Jing Yao¹;  Sun Yueming¹

¹School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, China
²Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China

邬理伟¹;  郑颖平¹;  王绍荣²;  王振荣²;  景尧¹;  孙岳明¹

¹东南大学化学化工学院, 南京 211189; ²中国科学院上海硅酸盐研究所, 上海 200050

Keywords:

Ce_0.8Sm_0.2O_1.9-δ;  La_0.9Sr_0.1Ga_0.8Mg_0.2O_3-δ;  composite electrolyte;  oxygen ionic conductivity

Ce_0.8Sm_0.2O_1.9-δ;  La_0.9Sr_0.1Ga_0.8Mg_0.2O_3-δ;  复合电解质;  氧离子电导率

PACS:

TM911.47

DOI:

10.3969/j.issn.1003-7985.2010.01018

Abstract:

Ce_0.8Sm_0.2O_1.9-δ-La_0.9Sr_0.1Ga_0.8Mg_0.2O_3-δ(SDC-LSGM)is prepared by the glycine-nitrate process(GNP).SDC-LSGM composite electrolyte samples with different weight ratios are prepared by the co-combustion method so as to obtain homogeneous nano-sized precursor powders. The X-ray diffraction(XRD)and the scan electron microscope(SEM)are used to investigate the phases and microstructures. The measurements and analyses of oxygen ionic conductivity of SDC-LSGM are carried out through the four-terminal direct current(DC)method and the electrochemical impendence spectroscopy, respectively. The optimum weight ratio of SDC-LSGM is 8〓 ∶2, of which the ionic conductivity is 0.113 S/cm at 800 ℃ and the conductivity activation energy is 0.620 eV. The impendence spectra shows that the grain boundary resistance becomes the main barrier for the ionic conductivity of electrolyte at lower temperatures. The appropriate introduction of LSGM to the electrolyte SDC can not only decrease the electronic conductivity but also improve the conditions of the grain and grain boundary, which is advantageous to cause an increase in oxygen ionic conductivity.

通过甘氨酸-硝酸盐(GNP)法合成了Ce_0.8Sm_0.2O_1.9-δ-La_0.9Sr_0.1Ga_0.8Mg_0.2O_3-δ(SDC-LSGM)复合电解质. 采取共燃烧法制备了一系列不同质量百分比的复合粉体以提高这2种粉体的混和均匀度. 通过XRD和SEM分析了复合电解质的物相和结构, 并且采用直流四端子法和交流阻抗谱研究分析了复合电解质的氧离子电导率. SDC与LSGM的最佳混合质量比为8〓 ∶2, 其电导率在800 ℃时为0.113 S/cm, 而电导活化能仅为0.620 eV. 交流阻抗谱显示, 随着温度的降低, 晶界电阻是复合电解质氧离子传输的主要障碍, 在SDC中掺入一定量的LSGM不仅可以减少电解质的电子传导, 还能改善电解质中晶粒与晶界微观结构, 有助于氧离子传导性能的提高.

References:

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Memo

Memo:

Biographies: Wu Liwei(1986—), male, graduate; Sun Yueming(corresponding author), male, doctor, professor, ypz_-99@yahoo.com.cn.
Foundation items: The National Basic Research Program of China(973 Program)(No.2007CB936300), the Natural Science Foundation of Jiangsu Province(No.BK2009293).
Citation: Wu Liwei, Zheng Yingping, Wang Shaorong, et al.Oxygen ionic conductivity of a composite electrolyte SDC-LSGM prepared via glycine-nitrate process[J]. Journal of Southeast University(English Edition), 2010, 26(1): 87-90.

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